Timeline for Is it okay to call a UART “RS-232” if it doesn’t respect voltage levels specified in the RS-232 standard?
Current License: CC BY-SA 4.0
11 events
| when toggle format | what | by | license | comment | |
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| Jan 12 at 22:05 | vote | accept | pnatk | ||
| Jan 12 at 22:05 | |||||
| Nov 24, 2023 at 16:56 | comment | added | Math Keeps Me Busy | "RS232 is perhaps the best known and oldest of the serial links" AFAIK, teletypes used (digital) current loop before RS232. | |
| Nov 24, 2023 at 8:58 | history | edited | Neil_UK | CC BY-SA 4.0 |
whatever
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| Nov 24, 2023 at 8:57 | comment | added | Justme | RS-232 also doesn't require +/-15V, that's just the maximum allowed standard compliant voltage transmitted out when a standard compliant receiver is connected. | |
| Nov 24, 2023 at 8:42 | history | edited | Neil_UK | CC BY-SA 4.0 |
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| Nov 23, 2023 at 14:51 | comment | added | Justme | @Neil_UK You can leave an UART as logic levels, or you can use a PHY after the UART for any electrical standard you want - be it RS-232, RS-485, CAN, LVDS, LVPECL or whatever. Even if bit frame waveforms look similar on all interfaces, no other interface looks RS-232-alike except the RS-232 signals itself. | |
| Nov 23, 2023 at 13:29 | comment | added | Neil_UK | @Justme how do you interpret 'RS232-like'? I would interpret that as not RS232, but similar in some respects. | |
| Nov 23, 2023 at 13:28 | comment | added | Aaron D. Marasco | The first datasheet actually calls it "TTL-232" as a shortcut to explain "232 timing on TTL voltage levels." It then goes on to say it's available in 3.3V or 5V models. I couldn't get the datasheet for the second. | |
| Nov 23, 2023 at 13:27 | comment | added | Justme | I would not call 0V/5V logic level signals with the term RS-232-alike, because they are not within RS-232 specs. Sure, the UART waveforms, transmitted as logic signals or RS-232 signals, may look alike, if inversion, slew rate, and voltage levels are ignored. | |
| Nov 23, 2023 at 12:30 | history | edited | Neil_UK | CC BY-SA 4.0 |
added 356 characters in body
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| Nov 23, 2023 at 12:23 | history | answered | Neil_UK | CC BY-SA 4.0 |